MI SB1096

Amends the definition and valuation of "true cash value" for property tax assessment purposes under Michigan's General Property Tax Act.

Establishes a specific valuation method for wind energy systems based on original installed cost multiplied by an applicable depreciation multiplier, with a minimum value of $29,067 per megawatt.

Requires the State Tax Commission to adopt a multiplier table by November 30, 2018 (or December 31, 2018 as backup deadline) assuming a 30-year service life, starting multiplier of 1.0, annual reduction of 0.04, and a minimum multiplier floor of 0.4.

Clarifies that assessors must exclude certain costs from real property sales data when determining assessments, including financing costs, personal property amounts, and surveying fees included in purchase prices.

Specifies that normal repairs and maintenance to residential property (painting, roof repairs, rewiring, furnace replacement, etc.) cannot increase assessed value until the property is sold.